Spark-plug.



AI A. EDEY.

SPARK PLUG.

APPLICATION man ocT.1, 1915.

Patented J an. 11, 1916.

mmm.,

UBREY AUGUSTS EDEY, OF MBXLE, ALBAMA.

SPARK-FLUG'.

menace.,

To aZZ whom it may concern;

Be it known that l, AUBREY A. Emir, a citizen of the United States, residing at Mobile, in the county o'f Mobile and State of Alabama, havev invented certain new and useful improvements in Spark-Plugs; and l hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention relates to ignition or spark plugs employed in connection with` gasv or other types of explosive engines.

ln spark plugs as ordinarily constructed, the end is open and the oil used to lubricate the piston '1s constantly being thrown up against and into the opening in or at the end of the plug, with the result that the spark points andthe inside of the plug quickly become fouled with dirt oil and carbon.

The primary object o my invention is to provide a spark plug of the character referred to which will efectually exclude or prevent the oil used to lubricate the piston from being thrown up against` and into the opening at the end of the plug, and thus preventfouling the spark points and the inside of the plug.

A further object is to provide a removable cap or cover for the end of the plug that may be easily detached to permit any accumulation of lubricant or carbon that may occur to be readily cleaned od, so that the spark points and inside of the plug may be kept clean.

The invention will first be hereinafter more particularly described, with reference to the accompanying drawings, which are to be taken as a part of this specification, and then pointedout in the claims at the end of the description.

In said drawings, Figure 1 represents a side elevation of a spark plug embodying my improvement; Fig. 2 isa detail sectional view of the same; Fig. 3 is a perspective view of a removable cap or cover adapted to be screwed upon the end of the spark plug so as t'o -form in eii'ect an extension thereof open at itsend with a baiiie plate or cover for said open end; and Fig. 4 is a detail sectional view of a modification of the invention.

In said drawings, I have shown by way of illustration a spark plug having the usual insulating core A, of porcelain or other non-conducting material, inclosed or speccation of Letters Patent. :Patented Jenn, itil, lgtdo .application led (Butcher i., 19M. Serial No. 58,560.

embraced by a metal casting or Casin- '18, which 1s exteriorly threaded to adapt it to be screwed into a suitably threaded opening in the cylinder of the engine; said parts beat ing the hole in the end of the plug, and at the same time permit the `admission of gas to and the escape of the waste products of combustion from the chamber in which the circuit terminals or' spark points are located. To this end the cap C consists essentially of a cylindrical portion c, which is interiorly threaded to adapt it to be screwed upon an exteriorly threaded end or reduced extension b of the casing B; said cylindrical part c terminating in a conical portion c1, which forms in effect, when the cap is screwed upon the casing B, a conical extension of the plug or tube'B, open at its lower end.

from the underside ofthe cap 'rom enter1 In close proximity to but slightly separated Y from said open end is a baille plate or cover o2, which is preferably connected with said cylindrical part c by means of two or more posts o8 integral therewith, so that the plate or cover 02 will eiectually cover the open end of the plug and prevent the entrance of d1 integral with the conical portion of thecapand inieffect forming an extension of the plug; said inverted conical portion being provided with a series of openings d through the inclined wall of the part d, so as in eect to, provide a series of standards connecting the balie-plate and cap;

thus provide a very e''ectual cover for the open end of the plug, which will pro- `means for screwing on or seeuringAthe cap, as shown in Figs. 2 and 4 of the drawings.

usual threads for screwing it into the en ine cylinder, a threaded portion or equiva ent A lgasket or acking ring E of copper or other metal mliy be used to form an oil-tight joint between the plug proper and the attachment or cap.

' It will be observed that the attachment or cap of the 'described construction in effect serves to reduce the end of the plug and cover the hole therein, the cover being imperforate and so placed with reference to the vopening in the end of the plug that the total outlet around said edges of the opening, between it and the cover.. is ynot less than the size of the reduced hole at the end of the plug.- The cap is preferably made of brass, 1n one integral structure,`by molding or otherwise, though any suitable metal mayv be employed, and `by its use the fouling of the sparking points is rendered practically Unpossible, as nothing can pass through the imperforate baille-plate, and it also affords a means for keeping the sparking points dry. Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In combination with a spark plug, an

open-ended cover for the electrodes of saidplug carrying an imperforate baiile-plate in front of said opening and slightly separated therefrom.

2. In combination with a spark plug, a cap for the spark points carried by said plug, said cap having a conical portiono en at its apex and carrying a baile p te slightly separated from said opening.

3. In combination with a spark plug hav-V ing an open end, a cap secured on said end V"''having a conical portion open at its apex and in effect forming an extension of the tube; said cap supporting a bameplate slightly separated om the opening inthe apexof the cone.:

4. In combination with a sparkplug having an open end, a cap of cylindrical forniA screwed on said end and having a conical portion open at its apex and in eiect forming an extension of the tube; said cap supporting a baille-plate slightly separated from the opening in the apex of the cone; there being an uninclosed space between the apex of the cone 4and said baille-plate.

5. In combination with a spark plug having an exteriorly threaded end, a cap of cylindrical form screwed on said end having a conical portion open at its apex and in eiect forming an extension ofthe tube, and a baille-plate carried by said cap slightly below and separated from the opening in the apex of the cone so as to leave an unlnclosed \s ace between said opening and said bailleate. p 6. An attachment for a spark plug con- -sisting of a substantially cylindrical body interiorly threaded'at one end to adapt it to be screwed on an exteriorly threaded end of the plug and carrying at its other end an imperforate plate supported by arms or posts integral with said body and plate; said cylindrical body having a conical portion extending therefrom toward said plate and terminatingclose to the latter but slightly separated therefrom so as to leave an uninclosed space between the plate and the apex of the cone, the latter having an opening in its apex.l

7. In combination with a spark plug, a cap adapted to be secured to one end thereof to cover the electrodes carried by said plug,

said cap having `il conical portion open at its apex, and'l means carried by said cap slightly in advance of said opening adapted to prevent oil and dirt from splashingonto the electrodes of the plug.

In testimony that I claim the foregoing as my own, I aiix my signature in presence of two witnesses.

AUBREY AUGUSTUS EDEY. A

Witnesses:

P. J. GOODMAN, T. H. HALLnvELL. 

